[Human reaction of external respiration and gas exchange in the acute period of adaptation to water immersion].
Responses of respiration and gas exchange of 6 test subjects to 3-day dry immersion were investigated. It was found that an exposure to immersion was accompanied by decreases in respiratory volume, vital lung capacity, maximum pulmonary ventilation, and breathing time retention during inhalation and expiration. These changes were paralleled by an increase in the portion of the functional dead space and a decrease in the portion of the efficient alveolar volume. The permeability of respiratory tracts remained unchanged. These changes seem to be of the type of total respiratory insufficiency induced by circulatory disorders. This may be one of the factors responsible for a decline in human tolerance to exercises and acceleration applied after an exposure to simulated weightlessness.
D000222:Adaptation, Physiological; D000328:Adult; D002245:Carbon Dioxide / Q000502:physiology*; D006801:Humans; D007101:Immersion / Q000503:physiopathology*; D010100:Oxygen / Q000502:physiology*; D012119:Respiration; D013997:Time Factors; D014893:Weightlessness
D002245:Carbon Dioxide; D010100:Oxygen
Raktsiia vneshnego dykhaniia i gazoobmena cheloveka v ostrom periode adaptatsii k vodnoi immersii.